104 HB700 | CPU | PMC921xEx | en | 24-04
Deployment CPU iC921xM-EC
System variables and status information > System variables
EtherCAT system variables
System variable Type - description
SB_DIAG_ALARM_ACK_PENDING ULINT - acknowledgement diagnostic status of the modules
■ As soon as a module on the SliceBus requests an acknowl-
edgement of the diagnostic alarm, according to the slot position
the corresponding bit is set in the 64-bit register
.
The system variables for diagnostics of the EtherCAT master and the connected
EtherCA
T slaves are listed below.
System variable Description
EC_MASTER_STATE BYTE - master state
■ Returns the state of the EtherCAT master:
– 00h: Unknown - the state is unknown.
– 01h: INIT
– 02h: PreOp
– 04h: SafeOp
– 08h: OP
EC_MASTER_LINK_CONNECTED BOOL - physical connection
■ Set when an Ethernet cable is connected to the
EtherCA
T master.
EC_TOPOLOGY_OK BOOL - topology OK
■ Set when current topology and configured topology
match.
EC_DC_IN_SYNC BOOL - distributed clocks
■ Set when the distributed clocks are synchronized.
EC_CYCLIC_LOST_FRAMES DWORD - missing frames (cyclic)
■ Returns the number of frames lost during cyclic com-
munication.
EC_ACYCLIC_LOST_FRAMES DWORD - missing frames (acyclic)
■ Returns the number of frames lost during acyclic com-
munication.
EC_NUM_CONFIGURED_SLAVES WORD - configured number of slaves
■ Returns the number of configured EtherCAT slaves.
EC_NUM_AVAILABLE_SLAVES WORD - number of slaves in the network
■ Returns the number of EtherCAT slaves found when
searching the EtherCA
T network.
EC_SLAVES_IN_MASTER_STATE BOOL - EtherCAT slaves in master state
■ Set when all EtherCAT slaves on the EtherCAT master
have the state of the EtherCA
T master.
EC_SLAVE_STATION_ADDRESS ARRAY[0…512] OF WORD
1)
- slave addresses
■ Returns all addresses of the EtherCAT slaves con-
nected to the EtherCA
T master.
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